tact

Short definition from Wiktionary

Noun

1. 1
   Sensitive mental touch; special skill or faculty; keen perception or discernment; ready power of appreciating and doing what is required by circumstances; the ability to say the right thing.
2. 2
   Propriety; manners (etiquette).
3. 3
   The sense of touch; feeling.
4. 4
   The stroke in beating time.
5. 5
   A verbal operant which is controlled by a nonverbal stimulus (such as an object, event, or property of an object) and is maintained by nonspecific social reinforcement (praise).
6. 6
   Clipping of tactic.

Verb

1. 1
   To use a tact (a kind of verbal operant).